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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b2105b569f36b4327d90ed509d96e84fabba48c483f96dc8519cabb7cd0479' 
  AND token = 'Xoy16h97H9+Te7o+w0DlJwYTdBaMK3GoZnLI25sxBgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}